Polis Massa was once an arid, habitable, barren planetoid and originally the homeworld of the origin of the little-known Eellayin civilization, who dwelt in underground cities such as Wiyentaah. Polis Massa was later struck by a mysterious cataclysm. This natural disaster destroyed the planet and formed a field of asteroids which remained known as Polis Massa, especially the largest of them. The Eellayin civilization disappeared.